AP BIOLOGY

Detailed explanation-1: -If a cell (with 10% oxygen in it) is in a solution of 3% oxygen molecules and the oxygen can cross the cell’s membrane, what do you predict will happen to the oxygen? Water will move out of the cell causing the cell to shrink.

Detailed explanation-2: -If a cell (with no dye in it) is in a solution of 10% dye molecules and the dye can cross the cell’s membrane, what do you predict will happen to the dye? The alcohol will move into the cell.

Detailed explanation-3: -Because the cell membrane is semipermeable, only small, uncharged substances like carbon dioxide and oxygen can easily diffuse across it.

Detailed explanation-4: -A cell placed into a hypertonic solution will shrivel and die by a process known as plasmolysis. An isotonic solution is any external solution that has the same solute concentration and water concentration compared to body fluids. In an isotonic solution, no net movement of water will take place.

Detailed explanation-5: -Water transport across cell membranes occurs by diffusion and osmosis. The effective osmolality of a biological fluid is determined by the total solute concentrations and the solutes’ permeabilities, relative to water.